Question about 1989 Buick Riviera

1 Answer

I have a 1989 rivera, was told my ecm was good but the prom was bad. when ecm was pulled it was out of a 88 olds 88 special. Have bought four so far none work 100%. I tried Buick to get the computer [ecm]and the prom number all they can tell me is it's no longer stocked and there is no olds dealer to ask about the olds ecm I have now and it has been in the car since before I bought it eight years ago and worked perfect till this problem. I found a rivera ecm up north was assured it was the right one, but it has the same problems the others have I bought. The car has CRT screen and this ecm I just bought wont let it show the tac reading and the temp will only read cold, every few mintues it does a system check on the screen over and over and after a while the screen goes black, but if you turn the key off and back on it lights back up. At speeds below 60mph it stumbles and jerks as if you were turning the car on and off above that speed it runs good for a while them stumbles once in a while, some times the screen goes black but not all of the time. Does anyone know the correct ecm # and the prom # for the rivera and or the same for the olds 88? or for sure what is wrong. I'm going broke and getting a nice collection of ecm's that don't work. Thanks for any help. Ron Johnson Fern Park, Fl. 407- 331-0691

Posted by on

  • rrj914 Feb 05, 2010

    Moving in that direction



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 1,068 Answers

Ron it was great talking with you and we will get you on the right track soon here. make sure you pull the codes out of the computer and i will talk to you tomorrow.

Posted on Feb 05, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do u no if your car computer need to be flash

Hook it up to a code reader via OBDII for specifics. Tecnically, there is no reason to flash your ECM unless you are using another ECM from a parts car...for say a 1989 Chevy. This ECM was used on the 1989 S-10 truck with the 2.5L four cylinder, the ’89 Camaro with the 5.0L HO V8 and the ’89 Corvette with the 5.7L Tuned-Port V8 engine. The only difference (aside from the vehicle wiring harness pin population) was the PROM. The PROM contains the calibration software for the ECM. Another reason would be to bypass a security locked ECM like a 2001 Pontiac GT which was notorious for shutting off the fuel pump if the security chip in the key lost connection through switched power.

Sep 21, 2016 | Cars & Trucks

1 Answer

No injector pulse on 89 olds 3.8

ECM? Check grounds also. The ECM uses the ground circuit to fire the injectors. Bad injector ground, no fuel.

Aug 15, 2014 | 1989 Oldsmobile Delta 88

1 Answer

Location of ECM in 91 corvette

OBD-I ECMs were equipped with the Mem-Cal and Cal-Pak to run the base operations. The programming that your ECM uses for normal operations comes from a PROM that you remove and use in the new ECM...unless that is the problem. Its not unusual for a PROM to become loose or just get dirty pins so contacts are poor.

ECM programming didn't come into play until OBD-II allowed in-car during driving program access and modification. People still set their lap-tops in the passenger seat and drive and make changes at stop lites until they get performance they like...
OBD-I folks have to pull the prom, insert new one and hope its what you want. There is equipment to burn your own and write your own performance programs etc...but most guys don;t go that far because its a few hundred bucks worth of stuff thats good for nuthin else and there are too many places that do custom burns based on your input or data logs.

Look for a spare ECM on Flea-Bay but DO check your prom before buying one. They go for abouit $100-$150 used.

Oct 23, 2013 | Cars & Trucks

1 Answer

87 Buick century...3.8 well maintained...had in garage for a month...all sensors have been verified..bought new computer and used old proms..still no resolve...finally took to dealer and they said a bad...

I doubt the ECM from a C body would work on your Century. I would probably buy a used computer and prom from a car exactly like yours. The prom is calibrated to the body style, engine, and trans. Each year and model can be different due to emissions standards.

Jul 11, 2013 | Cars & Trucks

1 Answer

1989 Celebrity stalls and dies at stop signs, idles rough (up and down). An experienced mechanic says the symptoms were common to the PROM going bad. Where can I find a PROM. It is a 2.8L with...

If you have had the battery unhooked or the battery went dead then you will need to take it into a shop and have the minimum idle relearned. The prom is inside the Engine Control Computer (ECM), I doubt that that is the problem though.

Jun 29, 2011 | 1989 Chevrolet Celebrity

1 Answer

How to Replace PROM in 1995 Buick Lasabre

The Prom (programmable read only memory) is inside the computers (known as the ECM) sheet metal case, there is a small sheet metal cover over it, remove that cover and simply pull it out using the installation and removal fixture that the prom sits on on top of its socket, VERY IMPORTANT! pay attention to the direction the old one came out and install the new Prom the same way, NEVER FORCE THE PROM INTO ITS SOCKET, IT SHOULD PLUG IN WITH LTTLE EFFORT.

Jan 30, 2011 | 1995 Buick LeSabre

1 Answer

Where is the PCM located on a 1991 Oldsmobile 98 Regency elite?

The PCMor powertrain control module is only on 1996 and newer cars.Earlier models have a ECM or electronic control module/pcm.You want to change the ECM if its a 1992.Its located under the right hand side of the instrument panel.The ecm has a prom( programmable read only memory)in it.You will need to remove this from the old ecm and install in the new ecm.The ECM/PCM can be used in many different GM vehicles but the prom is very specific and must be used only in the vehicle it was designed.The prom will not come with the new ecm and must be carefully removed and installed on the new ecm.There also is a CALPAK in the ECM ( A devise for fuel delivery) This may come with the new ECM But make sure all parts are the same.You should get a vehicle repair manual to do this job correctly,and make sure you do not damage your PROM.Your PROM is very IMPORTANT!

Oct 21, 2008 | 1991 Oldsmobile Ninety Eight

1 Answer

1996 ECM

It is possible that the three slot box is compatible. Check on your ECM for a label. Use the numbers on that label to find the correct match. You can try a used parts store or wrecking yard, as well as the internet. You may have to remove the PROM from your old ECM and place it in the new ECM. Be very careful as the PROM is sensitive to static electricity. Let me know if you have any other questions.

Aug 18, 2008 | 1996 Jeep Grand Cherokee

1 Answer

1988 olds trofeo digital dash

As long as the 89 was produced before september (88) the 89 release models one wire was backward in the production line.

Jul 12, 2008 | 1988 Oldsmobile Toronado

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

68 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts


Level 3 Expert

76164 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8273 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides